Merge usb_class_*.[ch] into usb_interface_*.[ch] respectively.

right/usb_interface_keyboard.h

@@ -7,6 +7,20 @@
 
 // Macros:
 
+    #define USB_KEYBOARD_CLASS (0x03U)
+    #define USB_KEYBOARD_SUBCLASS (0x01U)
+    #define USB_KEYBOARD_PROTOCOL (0x01U)
+
+    #define USB_KEYBOARD_INTERFACE_INDEX (1U)
+    #define USB_KEYBOARD_INTERFACE_COUNT (1U)
+    #define USB_KEYBOARD_INTERFACE_ALTERNATE_SETTING (0U)
+
+    #define USB_KEYBOARD_ENDPOINT_ID (2U)
+    #define USB_KEYBOARD_ENDPOINT_COUNT (1U)
+
+    #define USB_KEYBOARD_INTERRUPT_IN_PACKET_SIZE (8U)
+    #define USB_KEYBOARD_INTERRUPT_IN_INTERVAL (0x04U)
+
     #define USB_KEYBOARD_REPORT_LENGTH (0x08U)
 
 // Typedefs:
@@ -17,6 +31,9 @@
         uint8_t scancodes[USB_KEYBOARD_MAX_KEYS];
     } __attribute__ ((packed)) usb_keyboard_report_t;
 
+// Variables:
+    extern usb_device_class_struct_t UsbKeyboardClass;
+
 // Functions:
 
     extern usb_status_t UsbKeyboardCallback(class_handle_t handle, uint32_t event, void *param);